Tensioning device for automatically threading loom shuttles



Aug-"20, 1929- H. A. DAVIS I 1,725,621

' TENSIONING DEVICE FOR AUTOMATICALLY THREADING LOOM SHUTTLES I Filed Aug. 28, 1928 A TTORNEY /NVE/ TOR Patented Aug. 20, 1929.

UNITED STATES PATENT OFFICE.

HARRY A. DAVIS, OF HOBEIDALE, MA$SACHUSETTS, ASSIGNOR TD DRAIER CORPORA- TION, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

TENSIONING DEVICE FOR AUTOIEATICALLY THREADING LOOM SHUTTLES.

Application filed August 28, 1928.

This invention relates to automatically threading loom shuttles in which the filling carrier is changed from time to time, and more particularly to the tensioning means for insuring proper tension on the thread during weavin In filling replenishing shuttles of the abovementioned type the shuttle is partially threaded on the first pick following replenishment and completely threaded on the return of the shuttle to the filling replenishing box, the result being in many cases that full weaving tension is not placed upon the thread on the first pick of the shuttle following replenishment.

In weaving with certain kind or character of filling it is desirable that thethread be placed under tension on the first pick of the shuttle following replenishment, and that such tension be thereafter continued throughout the weaving operation. Should this not occur in weaving with certain kind or character of filling such, for instance, as silk, artificial silk, rayon, and the like, the resulting cloth is liable to reveal the defect by the production of what is known as shiners.

An important feature of the present invention therefore consists in simple yet effective tensioning means applled to a filling replenishing shuttle into control of which the thread will pass on the first pick following replenishment and apply the same tension to the thread on the first pick as on subsequent picks during weaving.

The invention and novel features thereof will best be made clear from the following description and the accompanying drawings of one good form thereof.

In the drawings:

Fig. 1 is an end perspective view of a filling replenishing shuttle provided with the present invention;

Fig. 2 is a plan view showing a thread block for automatically threading shuttles provided with the present invention; 7

Fig. 3 is a section on the line 38 of Fig. 2; and

Fig. 4 is a perspective view of a threading block provided with the present invention and viewing the threading block from the bobbin chamber.

The shuttle 1 is provided with the bobbin chamber 2 in which the filling carrier 3 is detachably supported by the usual means em- Serial No. 302,558.

ployed in filling replenishing shuttles. The shuttle 1 is provided with, a longitudinally extending thread passage and a side delivery eye 4%, and in the present instance of the inventlon, the longitudinally extending thread passage 5 1s formed in a threading block 6 which may be appropriately secured at the dellvery end of the shuttle by the usual meansasheretofore employed. Between the fixed side walls 7 and 8 of the threading block is the longitudinally extending thread passage 5 in which the tensioning device of the present lnvention is fixed.

In accordance with the present invention, the tensioning device comprises two series of tensioning members arranged in staggered relation in the longitudinal thread passage, the lower end portions of the tensioning members being secured in the bottom of the longitudinally extending thread passage and hav ng their upper portions oppositely flarmg innon-overlapping relation, and secured at thelr upper ends to the fixed walls of the thread passage.

In the present instance of the invention, the tensionlng members are shown as formed so of pins 9 and 10, the lower end portions of whlch are secured in fixed position substantially central of the longitudinal passage 5, as indicated at 11, and from this point the tensioning pins 9 extend upwardly and flare out wardly, as at 12, and have their upper ends 0 secured in the recesses 13 formed in the wall 7 of the threading block. The associated series of staggered pins 10 are likewise secured at their lower ends substantially central of the longitudinal passage 5 and have their upper portions flared outwardly, as at 14, with the upper ends of the pins secured at 15 in the fixed wall 8 of the threading block. The'upper outwardly flaring portions of the tensioning pins may be conveniently formed by bending the pins between their ends, as indicated at 16, the result being that the outwardlyfiaring portions of the tensioning pins are in non-overlapping position and provide a trough or recess between the out-- wardly flaring ends of the pins to receive the thread on the first pick of the shuttle following replenishment.

To insure that the swirling thread a shall pass between the two series of staggered related pins on the first pick of the shuttle following replenishment, one of the pins 10 adjacent the entrance to the longitudinal passage 5 is arranged diagonally in a clownwardly inclined direction to not interfere with. or arrest the swirling thread but permit it to pass into control of the tensioning device. Preferably the pin last described has its upper end secured to the wall of the thread passage opposite the side delivery eye, while its lower end is carried diagonally of the thread passage and is secured substantially central of the longitudinal thread passage, the result being that as the swirling thread is withdrawn from the shuttle, the pin described, with which the swirling thread may contact, will not interfere with its swirling action, but, on the contrary, will permit it to pass downwardly between the staggered related pins on the first pick of the shuttle and have the weaving tension applied to the thread to insure that it will be laid under proper tension in the shed.

The number of tensioning members or pins constituting each series may be varied, of course, the essentials in this respect being that the tensioning members or pins be arrangedin staggered relation in the longitudinal thread passage and have their lower ends secured in the bottom of the longitudinal passage, substantially central thereof, while their upper end portions fiare outwardly in opposite ,directions in non-overlapping relation to form a troughlike recess for the reception of the thread on the first pick of the shuttle and insure its passage between the staggered related pins for the application of the weaving tension. 7

Mounted on the threading block at or adja cent the entrance end thereof is a thread guide 18, the surface 19 of which extends laterally and downwardly relative to the thread passage in the formation of a thread guiding surface 20 at the lower portion of the guide.

It may be desirable in some cases when weaving with some kinds or characters of thread to provide a tensiondevice at the entrance of the thread passage, and in the present instance of the invention this is provided by a slot formed in the thread guide 18 in which is mounted a friction pad 21 of suitable friction material, such, for instance, as felt, or the like, and since the pad 21 is retained within the recess of the guide it overlies the thread at the entrance to the thread passage, as indicated at 22, Figs. 1 and 3.

On the first pick of the shuttle following replenishment, the swirling thread will pass downwardly over the curved surface of the guide 18 and finally be positioned below the surface 20 which is lower than the bend formed in the tensioning members or pins 9 and 10, as indicated in Fig; 3, the result being that when, on the first pick following replenishment, the thread passes below the surface 20, it is depressed in the troughlike recess formed by the outwardly flaring ends of the tensioning members and passes at once into the full tension control of the tensioning device and applies the same tension to the thread on the first pick of the shuttle following replenishment as exists in subsequent weaving.

lVhen the thread has been positioned as above described, it will take a serpentine course longitudinally of the thread passage, as indicated by the thread a in Fig. 2, and finally be delivered from the thread passage under the guide surface 26 towards the side delivery eye.

From the construction described it will be obvious that the present invention provides a simple and effective means for applying tension to the thread on the first pick of the shuttle following replenishment and continuance of the same tension thereafter during the weaving operation;

lVhat is claimed is 1. An automatically threading loom shuttle having a longitudinally extending thread passage and side delivery eye, and a thread tensioning device comprising two series of thread tensioning pins arranged in fixed staggered relation in the thread passage, one of which series has its upper ends turned outwardly and secured in permanent position to the fixed wall of the thread passage at one side thereof, and the other series of which has its upper ends turned outwardly-and secured in permanent position to the opposite fixed wall of the thread passage in non-overlapping relation with the first series to form a thread receiving trough, the lower ends of the pins of each series being secured in fixed posi tion in the bottom wall of the thread passage, and a pad of yielding material supported above the thread at the entrance to the thread passage. V i

2. An automatically threading loom shuttle having a longitudinally extending thread passage and side delivery eye, a series of fixed tensioning pins at each side of the thread passage having their upper ends flared outwardly in non-overlapping relation forming a thread-receiving trough and secured in fixed position in the side wall of the thread passage and their lower ends secured in fixed position in the center of the bottom wall of the thread passage in staggered relation;

3. An automatically threading loom shuttle having a side delivery eye, a threading block provided with a longitudinally extending thread passage, a series of thread tensioning members at each side of the thread passage having their upper portions flared outwardly in non-overlapping relation and secured in fixed position and their lower ends secured in fixed position at the bottom of the longitudinal thread passage, one of said members being ar anged diagonally of the thread passage adjacent the entrance thereto in non-interfering relation with the swirling thread that the thread may enter between the tensioning members and be tensioned on the first pick of the shuttle following replenishment.

4:. An automatically threading loom shuttle having a side delivery eye, a threading block having a longitudinally extending thread passage, a tensioning device in the thread passage comprising a series of thread tensioning pins at each side of the thread passage arranged in staggered relation and having their upper ends flared outwardly and secured to the fixed side walls of the thread passage and their lower ends secured in fixed position in the bottom wall of the thread passage, one of the pins being arranged diagonally of the thread passage near the entrance thereto from the bobbin chamber and in noninterfering relation with the swirling thread that the thread may enter between the tensioning pins and be tensioned on the first pick of the shuttle following replenishment.

5. An automatically threading loom shuttle having a longitudinally extending thread passage and side delivery eye, a series of fixed tensioning pins at each side of the thread passage arranged in staggered relation and having their lower ends secured in fixed position in the central portion of the lower wall of the thread passage and extending upwardly therefrom and flared outwardly that a thread passing longitudinally of the thread passage may rest upon the lower wall of the thread passage while still subjected to the tensioning effect of the lower end portions of the two series of pins.

In testimony whereof, I have signed my name to this specification.

HARRY A. DAVIS. 

